Motor

ABSTRACT

Provided is a motor which includes a housing and a stator disposed in the housing and a rotor disposed in the stator and a busbar disposed on one side of the stator, wherein the stator includes a stator core and a coil wound around the stator core and an insulator disposed between the stator core and the coil, the insulator includes a first insulator and a second insulator wherein the busbar includes a guide, wherein the guide is disposed between a first insulator and a second insulator.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/541,782, filed Aug. 15, 2019; which is a continuation of U.S.application Ser. No. 15/526,098, filed May 11, 2017, now U.S. Pat. No.10,432,060, issued Oct. 1, 2019, which is the U.S. national stageapplication of International Patent Application No. PCT/KR2015/012046,filed Nov. 10, 2015, which claims priority to Korean Patent ApplicationNo. 10-2014-0156397, filed Nov. 11, 2014, the disclosures of each ofwhich are incorporated herein by reference in their entirety.

BACKGROUND 1. Field of the Invention

The Present Invention Relates to a Motor, and More Particularly, to aMotor Including a busbar connecting coils connected in parallel to astator.

2. Discussion of Related Art

A motor includes a shaft formed to be rotatable, a rotor coupled to theshaft, and stators fixed inside a housing. The stators are installedalong a circumference of the rotor at regular intervals. Coils that forma rotating magnetic field are wound around the stators to induceelectrical interaction with the rotor and induce the rotor to rotate.

A busbar electrically connected to the coils is disposed on an upper endof the stator. The busbar generally includes a ring-shaped busbar bodyand terminals formed on the busbar body to be connected to the coils.

The coils and the terminals are generally fused to be connected to eachother, and thus problems in that coatings of the coils are worn due tovibration in an environment with strong vibration or connectionterminals of the coils are cut may occur.

A major cause of the problems is movement of the busbar due tovibration. A solution to inhibit movement of the busbar is impregnationor molding of a wire. However, the solution has problems in that anadditional process is needed and management and manufacturing costs areincreased.

SUMMARY OF THE INVENTION

The present invention is directed to a motor capable of inhibiting acoating of coil from being worn or cut by inhibiting a busbar frommoving without an additional process or component.

The scope of the present invention is not limited to the above-describedobjects, and other unmentioned objects may be clearly understood bythose skilled in the art from the following descriptions.

According to an aspect of the present invention, there is provided amotor comprising a motor comprising a housing and a stator disposed inthe housing and a rotor disposed in the stator and a busbar disposed onone side of the stator, wherein the stator includes a stator core, acoil wound around the stator core and an insulator disposed between thestator core and the coil, the insulator includes a first insulator, asecond insulator, wherein the busbar includes a guide, wherein the guideis disposed between a first insulator and a second insulator.

The guide are provided as a plurality of guides, the plurality of guidesis disposed between a first insulator and a second insulator each.

The insulator includes a slot is disposed between adjacent the guide,and the upper end of insulator is disposed in the slot.

The upper end of insulator is in contact with an side surface of theguide.

A length of the guide in an axial direction is greater than a length aregion of the upper end of insulator which is in contact with the innercircumferential surface of the busbar in an axial direction.

The busbar includes a short protrusion that protrudes from the innercircumferential surface thereof to connect a plurality of guides and theshort protrusion is in contact with the upper surface of the insulator.

A position of the busbar is determined due to the upper surface of theinsulator in contact with the lateral surface of the guide.

The insulator includes an outer circumferential part that faces thehousing, an inner circumferential part that faces the rotor and anextension part that protrudes from the inner circumferential part towardthe busbar, and the extension part is in contact with the innercircumferential surface of the busbar and a lateral surface of theguide.

The xtension part and the guide are provided as a plurality of extensionparts and a plurality of guides and the extension parts and the guidesare alternately disposed along a circumference of the busbar.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the presentinvention will become more apparent to those of ordinary skill in theart by describing exemplary embodiments thereof in detail with referenceto the accompanying drawings, in which:

FIG. 1 is a view illustrating a motor according to one embodiment of thepresent invention;

FIG. 2 is a view illustrating a extension part and a guide according toa first modified example;

FIG. 3 is a cross-sectional view illustrating a contact state of theextension part and the guide shown in FIG. 2;

FIG. 4 is a view illustrating a state in which the extension part shownin FIG. 2 is forcibly inserted into the slot;

FIG. 5 is a view illustrating a extension part and a guide according toa second modified example;

FIG. 6 is a cross-sectional view illustrating a coupling state of theextension part and the slot shown in FIG. 5; and

FIG. 7 is a view illustrating a modified example of a extension part.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereinafter, exemplary embodiments of the present invention will bedescribed in detail with reference to the accompanying drawings.Purposes, specific advantages, and novel features of the inventionshould become clear from exemplary embodiments and the followingdetailed descriptions in connection with the accompanying drawing.Moreover, terms and words used in this specification and claims are notto be interpreted as being limited to commonly used meanings or meaningsin dictionaries and should be interpreted as having meanings andconcepts which are consistent with the technological scope of theinvention based on the principle that the inventors have appropriatelydefined concepts of the terms in order to describe the invention in thebest way. In the description of the invention, when it is determinedthat detailed descriptions of related well-known functions andconfigurations unnecessarily obscure the gist of the invention, thedetailed descriptions thereof will be omitted.

When a busbar is moved due to vibration, a coil wound around a statormoves while being connected to a terminal of the busbar, and thus acoating of the coil is peeled due to friction or is cut in severe cases.To fundamentally solve such problems, a motor according to oneembodiment of the present invention is a device invented to increase afixing force of a bus.

Hereinafter, a motor according to one embodiment of the presentinvention will be described in detail with reference to the accompanyingdrawings.

FIG. 1 is a view illustrating a motor according to one exemplaryembodiment of the present invention.

Referring to FIG. 1, the motor according to one exemplary embodiment ofthe present invention may include a stator 100, a busbar 200, a rotor300, and a shaft 400.

The stator 100 is coupled to a housing 10, and the rotor 300 is disposedinside the stator 100. The shaft 400 may be coupled to a center portionof the rotor 300. Coils 120 are wound around the stator 100 to have amagnetic pole. The rotor 300 is rotated by a magnetic field formed bythe winding of the coils 120, and the shaft 400 is rotated at the sametime.

The stator 100 may include a plurality of stator cores 110. In oneembodiment, the stator cores 110 may be formed by stacking a pluralityof steel plates which each include a ring-shaped yoke and stator teethdisposed in a circumferential direction and protruding from the yoketoward an inner side in a diameter direction at regular angles. Thecoils 120 that form a rotating magnetic field may be wound around thestator teeth. In this case, the coils 120 may be insulated by insulators(130: a first insulator 130A, a second insulator 130B)

Each of the insulators 130 may be coupled to upper and lower sides ofthe stator cores 110 and insulate so that a current does not flow fromthe coils 120 wound around the stator teeth to the stator cores 110. Theinsulators 130 may be formed of a resin material.

An inner circumferential part 130 a and an inner circumferential part130 b are respectively provided on an outer circumferential surface sideand an inner circumferential surface side of the insulator 130 toinhibit the coils 120 from being detached and guide a winding positionthereof.

The busbar 200 may be provided on the stator 100. The busbar 200, whichconnects the coils 120 disposed in parallel, is electrically connectedto the coils 120. A ring-shaped body 210 made of an insulating materialis provided on the busbar 200, and terminals 220 connected to the coils120 are provided on the body. The busbar 200 is connected to theterminals 220 and may supply power to the coils 120 through powerterminals receiving external power of mutually different poles.

The rotor 300 is disposed inside the stator 100. The rotor 300 mayinclude a rotor core and a magnet coupled to each other. Optionally, therotor core and the magnet may be integrally formed. Also, the rotor 300may be formed as a type of rotor in which a magnet is coupled to anouter circumferential surface of a rotor core or a type of rotor inwhich a magnet may be inserted into a pocket of a rotor core. A sensingmagnet that obtains position information of the rotor 300 is coupled toa plate and is installed on the rotor 300, or a rotor position sensingunit similar to the sensing magnet may be installed.

Both ends of the shaft 400 may be rotatably supported by a bearing.

Hereinafter, a configuration in which the insulators 130 support thebusbar 200 to inhibit the busbar 200 from moving will be described withreference to the drawing.

The motor according to one exemplary embodiment of the present inventionincreases a coupling force between the busbar 200 and the insulators 130through extension part s 131 and 132. The extension part s 131 and 132are in contact with an inner circumferential surface of the busbar 200and inhibit the busbar 200 from being moved due to vibration.

In the description of the extension part s, two types of the extensionpart s 131 and 132 will be described as examples according to a couplingstructure thereof with the busbar 200.

The Extension Part 131 According to a First Modified Example

FIG. 2 is a view illustrating a extension part and a guide according toa first modified example, FIG. 3 is a cross-sectional view illustratinga contact state of the extension part and the guide shown in FIG. 2, andFIG. 4 is a view illustrating a state in which the extension part shownin FIG. 2 is forcibly inserted into the slot. In FIGS. 2 to 4, onlyspecified parts are shown for a conceptually clear understanding of aconfiguration relation of the invention. Accordingly, the drawings maybe modified in various forms and may not be significantly limited to aspecific form illustrated in the drawings.

Referring to FIGS. 2 to 4, the extension part 131 may have a plate shapeextending upward from the inner circumferential part 130 a of theinsulator 130. The extension part 131 may be formed in a curved plateshape like the inner circumferential part 130 a of the insulator 130 sothat an outer circumferential surface thereof is in contact with theinner circumferential surface of the insulator 130. The extension part131 may be disposed on an upper surface of the inner circumferentialpart of each of the insulators 130.

While the extension part 131 may be described as being distinguishedfrom the inner circumferential part 130 a of the insulator 130 dependingon a shape and functional performance thereof, the extension part 131and the inner circumferential part 130 a may be one vertically connectedunit.

Meanwhile, a slot 230 into which the extension part 131 is inserted maybe formed in an inner circumferential surface of the body 210 of thebusbar 200. Referring to FIG. 3, the extension part 131 may be forciblyinserted into the slot 230 in a height direction thereof, i.e., a z-axisdirection of FIG. 3 (a y-axis of FIG. 3 is a radial direction of themotor), along guide units 240 disposed on both sides of the slot 230.Sides of the extension part 131 are in contact with and rub sides of theguide units 240 in areas A shown in FIG. 3. Thus, the busbar 200, whichis vulnerable to a fixing force, may be strongly fixed by the insulators130 without being shaken due to vibration. A length L1 of the guide 240in an axial direction may be greater than a length L2 a region of theextension part 131 which is in contact with the inner circumferentialsurface of the busbar 200 in an axial direction.

Referring to FIG. 4, the outer circumferential surface of the extensionpart 131 is in contact with the inner circumferential surface of thebusbar 200 provided with the slots 230 and is inserted into the slots230, and is in contact with and rubs an area B shown in FIG. 4. Thus,the busbar 200 may be more strongly fixed by contact surfaces betweenthe extension part 131 and the guide units 240 and contact surfacesbetween the slots 230 and the extension part 131.

The guide units 240 protrude inward from the inner circumferentialsurface of the busbar 200 to divide the slots 230. The guide units 240may be disposed in a circumferential direction at regular intervals.Positions of the guide units 240 may be determined to correspond topositions of the insulators 130.

The extension part 131 and the guide 240 are provided as a plurality ofextension parts 131 and a plurality of guides 240 and the extensionparts 131 and the guides 240 are alternately disposed along acircumference of the busbar 200. A position of the busbar 200 isdetermined due to the extension part 131 in contact with the lateralsurface of the guide 240.

Meanwhile, a stepped portion 231 may be formed in an area forming anupper edge of the slot 230. The stepped portion 231 connects theplurality of guides 240. The stepped portion 231 protrudes inward froman upper end of the inner circumferential surface of the busbar 200 andis in contact with an upper surface of the extension part 131. In thiscase, a stepped surface of the stepped portion 231 may be horizontallyformed, and correspondingly, the upper surface of the extension part 131may also be horizontally formed.

The Extension Part 132 According to a Second Modified Example

Hereinafter, the extension part 132 according to a second modifiedexample will be described with reference to the drawing on the basis ofa difference with the extension part 131 according to the first modifiedexample.

FIG. 5 is a view illustrating a extension part and a guide according toa second modified example, and FIG. 6 is a cross-sectional viewillustrating a coupling state of the extension part and the slot shownin FIG. 5. In FIGS. 5 and 6, only specified parts are shown for aconceptually clear understanding of the configuration relation of theinvention. Accordingly, the drawing may be modified in various forms andmay not be significantly limited to a specific form illustrated in thedrawings.

Referring to FIGS. 5 and 6, a hook 132 a may be formed on an upper endof the extension part 132. The hook 132 a may protrude inward from theupper end of the extension part 132 toward the center of the motor toform a blocking surface 132 b. A slot 230 may be formed to pass from alower end of the inner circumferential surface of the busbar 200 to theupper end thereof.

When the hook 132 a of the extension part 132 is inserted into the slot230 up to the upper end of the inner circumferential surface of the thebusbar 200, the blocking surface 132 b of the hook 132 a presses theupper end of the inner circumferential surface of the busbar 200 toinhibit the busbar from being moved by vibration.

FIG. 7 is a view illustrating a modified example of the extension part.

Referring to FIG. 7, a contact surface 232 of a slot 230 may be formedto be inclined by a predetermined angle R from a reference line CLformed in a z-axis direction of FIG. 7. That is, the slot 230 may beformed to be inclined toward the center of the body 210 from a y-axisdirection. Correspondingly, a side 132 c of the extension part 132 mayalso be formed to be inclined. The extension part 132 has a thickness(t)that decreases in a direction toward an upper side thereof. The abovestructure is for securing workability for an assembly of the slot 230and the extension part 132 in consideration of the body 210 of thebusbar 200 disposed above the insulators 130.

According to one embodiment of the present invention, a extension partconnected with an inner circumferential part of an insulator supports aninner circumferential surface of a guide of a busbar, and thus a motorcan inhibit the busbar from moving without an additional process orcomponent to inhibit a coating of a coil from being worn or cut.

Also, according to one embodiment of the present invention, a extensionpart a motor can more stably inhibit the busbar from moving with asimple assembly process.

As described above, the motor according to one exemplary embodiment ofthe present invention has been described in detail with reference to theexemplary embodiments.

While the present invention has been particularly described withreference to the exemplary embodiments, it should be understood by thoseof skilled in the art that various changes, modifications, andreplacements may be made without departing from the spirit and scope ofthe present invention. Therefore, the exemplary embodiments andaccompanying drawings should be considered in a descriptive sense onlyand not for purposes of limitation. Accordingly, the scope of theinvention is not limited by the embodiments and accompanying drawings.The scope of the invention is defined not by the detailed description ofthe invention but by the appended claims, and encompasses allmodifications and equivalents that fall within the scope of the appendedclaims.

DESCRIPTION OF SYMBOLS

-   -   100: STATOR    -   110: STATOR COIL    -   120: COIL    -   130: INSULATOR    -   130 a: INNER CIRCUMFERENTIAL PART    -   130 b: OUTER CIRCUMFERENTIAL PART    -   131,132: EXTENSION PARTS    -   132 a: HOOK    -   132 b: BLOCKING SURFACE    -   200: BUSBAR    -   210: BODY    -   220: TERMINAL    -   230: SLOT    -   240: GUIDE UNIT    -   300: ROTOR    -   400: SHAFT

What is claimed is:
 1. A motor comprising: a housing; a stator disposedin the housing; a rotor disposed in the stator; and a busbar disposed onone side of the stator, wherein the stator includes: a stator core; acoil wound around the stator core; and an insulator disposed between thestator core and the coil, wherein the insulator includes: a firstinsulator; and a second insulator; and wherein the busbar includes aguide, wherein the guide is disposed between a first insulator and asecond insulator.
 2. The motor of claim 1, wherein the guide is providedas a plurality of guides, and each guide of the plurality of guides isdisposed between a first insulator and a second insulator.
 3. The motorof claim 1, wherein the insulator includes a slot that is disposedadjacent the guide, and an upper end of the insulator is disposed in theslot.
 4. The motor of claim 1, wherein an upper end of the insulator isin contact with a side surface of the guide.
 5. The motor of claim 1,wherein a length of the guide in an axial direction is greater than alength of a region of an upper end of the insulator that is in contactwith an inner circumferential surface of the busbar in an axialdirection.
 6. The motor of claim 1, wherein the busbar includes a shortprotrusion that protrudes from an inner circumferential surface of thebusbar to connect a plurality of guides; and the short protrusion is incontact with an upper surface of the insulator.
 7. The motor of claim 1,wherein a position of the busbar is determined due to an upper surfaceof the insulator being in contact with a lateral surface of the guide.8. The motor of claim 1, wherein the insulator includes: an outercircumferential part that faces the housing; an inner circumferentialpart that faces the rotor; and an extension part that protrudes from theinner circumferential part toward the busbar, and the extension part isin contact with an inner circumferential surface of the busbar and alateral surface of the guide.
 9. The motor of claim 1, wherein theextension part and the guide are provided as a plurality of extensionparts and a plurality of guides; and the extension parts and the guidesare alternately disposed along a circumference of the busbar.